FAQ says one-way sync is possible, but i'm not clear how. i have my Android device set to sync to my NAS through my PC, and LOVE it. brilliant. so grateful. BUT does anyone know if i can make this one-way? i'd like to overwrite old files on NAS,add new files,but ignore deletions, (device runs out of room)and i don't want anything that happens on the NAS to change my device files.possible?